Shaped press-forged normally frangible inorganic crystals

Details Shaped press-forged normally frangible inorganic crystals Shaped press-forged normally frangible inorganic crystals

1978-02-06

1979-10-16

Kendell, Lorraine T.

Stock material or miscellaneous articles

Coated or structually defined flake, particle, cell, strand,...

252300, 264 1, 264320, 350 11, 350319, 423490, 428212, 428539, G02B 500, G02C 700

Patent

active

041714008

ABSTRACT:
A polycrystalline shaped article useful as a light-transmitting body or scintillation phosphor is formed from an essentially moncrystalline melt-grown macrocrystal ingot by pressing the ingot between opposed surfaces with no radial restraint, at a temperature below its melting point and under sufficient pressure to transform the ingot, in situ, into a fully dense, homogeneous, polycrystalline mass of unrestricted width.
A polycrystalline shaped article useful as a light-transmitting and/or light-generating body may also be formed from a fully dense, homogeneous, optically integral polycrystalline mass by pressing the polycrystalline mass between opposed surfaces with no radial constraint, at a temperature below its melting point, but greater than one-half its melting point measured in degrees centigrade, under sufficient pressure to form a relatively larger polycrystalline mass of lesser height.

REFERENCES:
patent: 3114601 (1963-12-01), Letter
patent: 3312759 (1967-04-01), Letter
patent: 3359066 (1967-12-01), Hatch et al.
patent: 3365271 (1968-01-01), Carnall et al.
patent: 3459503 (1969-08-01), Roy et al.
patent: 3794704 (1974-02-01), Strong
patent: 3883214 (1975-03-01), Hoffman
patent: 3894795 (1975-07-01), Laurens
patent: 4038201 (1977-07-01), Hargreaves

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